It is indeed an early form of the numeral "4". Your coin is dated 1514.
Here's a coin of 1504 to compare. And the earliest coin to bear an AD date and "Western" numerals, the plappart of St Gall dated 1424, also bears the numeral "4" in this same form; see the example near the bottom of
this page.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis